used_bibliography

#!/bin/bash

# Usage:
# used_bibliography file_without_extension
# or
# used_bibliography file_without_extension.aux

# Parse the arguments
if [ ! $# = 1 ]; then
	echo "Usage: $(basename $0) file.aux"
	exit
fi

# Search the aux-file
file=$1

if ! [ -e $file ] & [ -e $file.aux ]; then
	file=$file.aux
fi

if ! [ -e $file ]; then
	echo "Can't find $file."
	exit 1
fi

# Search for "\citation{.*}" in the aux-file => these are the cited references
cites=$(awk "/^\\\\citation{.*}$/{sub(\"^\\\\\\\citation{\",\"\"); sub(\"}$\",\"\"); print;}" $file | awk "{gsub(\",\",\"\n\"); print}" | sort | uniq )

# Search for "\bibdata{.*}" in the aux-file => these are the used bib-files.
bibs=$(awk "/^\\\\bibdata{.*}$/{sub(\"^\\\\\\\bibdata{\",\"\"); sub(\"}$\",\".bib\"); print;}" $file | awk "{gsub(\",\",\".bib\n\"); print;}" | sort | uniq | xargs kpsewhich)

# Extract the citations from the bib-files.
for cite in $cites; do
	for bib in $bibs; do
		awk "BEGIN {RS=\"\n@\"} /{$cite,/{sub(\"^@?\",\"@\");print \"% Search for $cite, Found in file $bib:\n\" \$0 ;}" $bib
	done
done